Jig



Oct. 2,1945. I c. GALLEY I 3 5 I J'IG Filed March 31, 1943 2 Sheefs-Sheet 1 INVENTOR.

r 091:.- 2, 1945. c. E. GALLEY I JIG Filed March 31, 1945 2 Sheets-Sheet 2 INVENTOR. Char/e55. Ga/k Patented Oct. 2, 1945 JIG Charles E. Galley, Chicago, Ill., assignor to Luxene Inc., a corporation of Delaware Application March 31, 1943, Serial No. 481,251

2 Claims.

This invention comprises a jig for disassembling members constituting an extrusion device or gun designed for forcing material into a denture mold.

The jig and the parts of the device necessary for understanding the invention are illustrated in the accompanying drawing in which Fig, 1 is a plan view of the jig;

Fig. 2 is an end view thereof;

Fig. 3 is a side View thereof; and

Fig. 4 is a cross section on the line 4-4 of Fig. 1.

The extrusion device or gun, for which the jig is intended, is made of a barrel a which is internally threaded for engaging a screw-threaded end of a nozzle 1); these are shown assembled in dotted lines on Fig. l, and the nozzle b is shown apart from the barrel a in full lines on the same figure. The nozzle 1) has the other end 6 threaded for engaging a sprue opening in the lid of a mold flask, and it has an intermediate hexagonally shaped body portion f for engagement by a wrench. Within the nozzle 1) there is a slidable piston d. When the gun is in use the nozzle b is attached to the flask lid by screwing the threaded end 6 into the sprue opening (using a wrench on the portion 1 for this pure pose), placing a charge of denture material in the nozzle, inserting the piston d, and then attaching the barrel a which carries a springpressed part contacting the piston; as the barrel .,a is turned on the nozzle b, the piston 11 is caused to travel within the nozzle and thus forces the material into the flask. When the molding operation is completed, it then becomes necessary to take the gun apart for cleaning and a new charge; but this is not easily accomplished, because the material extruded from the gun is one that sets up and hardens during the molding process, and it tends to jam the piston within the nozzle. The tool or jig forming the subject matter of this invention has for its object the ready disassembling of the extrusion device or gun without injuring the parts.

The jig comprises a bed plate I0 provided with holes I I for bolting it to a bench. On an extension I2 of the plate there projects upwardly a boss I3; the boss has a* parallel walled slot I4 which divides it into two sections I5 and I6. The section I 5 has a hexagonally or other polygonally shaped depression I! corresponding to the body portion 1 of the nozzle b, and the section I6 has a circular depression I8 for accommodating the end e of the nozzle; the slot provides a face I9 against which the body portion f is placed. By

merely dropping the portion f of the nozzle into the depression H, the barrel a can be readily unscrewed from the nozzle b by applying a wrench to the barrel.

On the bed plate I0 there also extends a series of upward projections which are in axial alignment. One of these is an internally threaded sleeve 20 in which there is mounted a long jack screw 2I with an operating handle 22. The next projection is a rest or support 23' having a depression 24 for receiving the threaded end 0 of the nozzle 1). The third is a boss 25 constructed like the boss I3 and having a slot 26 with a slot face 3|, a hexagonal depression 21 in a section 28, and a rounded depression 29 in a section '30 for mounting and restraining the nozzle 2) against turning and forward movement; the body portion 1 of the nozzle b fits into the depression 21 and engages the face 3|, the threaded end e lies in the depression- 29, and the other threaded end 0 is supported in the depression 24 with the axis of the nozzle in line with the screw 2I. As the screw 2| is turned into contact with the piston d within the nozzle, movement of the nozzle is prevented by its engagement with the slot face 3|. By this means there is a gradually increasing force exerted upon the piston (2 until the piston starts to move, and at a rate such that any tendency to tearing the walls of the nozzle is eliminated.

The jig as a whole constitutes an assembly of cooperating parts for the separation of the nozzle from the barrel and the ejection of the piston from the nozzle of the gun. It has been found to be a necessary adjunct to the utilization of the gun for extrusion of denture material into a denture molding flask as there is a tendency for freezing of the piston in the nozzle, and attempts to drive it out by ordinarily available means have caused tearing and consequent destruction of the nozzle.

What is claimed is:

l. Jig for disassembling a device including a nozzle with a body portion of polygonal cross section with threaded ends extending from the body portion and a piston slidable therein, comprising in combination a bed plate, a boss projecting from the bed plate and slotted to form two sections, one of said sections having a depression of polygonal shape for receiving the body portion'ofthe nozzle and the other section having a depression of semi-circular form for a threaded end of the nozzle, a rest for the opposite threaded end of the alignment with the piston-forcing means andi J:

10 dinal axialmovement.

against rotary and axial displacemenhsaid nozzle-supporting means comprising a boss slotted transversely to form two sections, one of said sections having a depression of polygonal shape for engaging the body portion against rotary displacement and the other portion having a depression of semi-circular form to fit and receive a threaded end extension and to form an abutment engaging the body portion against longitu- CHARLES E. GALLEY. 

